*{
    padding: 0;
    margin: 0;
}
li{
    list-style: none;
    text-align: center;
}
.wrap{
    height: 400px;
    width: 600px;
    /* background-color: red; */
    /* position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0; */
    margin: auto;
    border: 10px solid gray;
}
.wrap .top{
    height: 100px;
    width: 100%;
    background-color: blue;
}
.wrap .top ul{
    width: 100%;
    height: 100px;
    display: flex;
}
.wrap .top ul li{
    width: 198px;
    height: 100%;
    line-height: 100px;
    font-size: 25px;
    color: white;
    border: 1px solid gray;
}
.wrap .top ul li.active{
    background-color: tomato;
}
.wrap .bottom{
    height: 300px;
    width: 100%;
    position: relative;
}
.wrap .bottom ul{
    width: 100%;
    height: 300px;
}
.wrap .bottom ul li{
    width: 598px;
    height: 100%;
    line-height: 300px;
    font-size:55px;
    color: white;
    border: 1px solid gray;
    position: absolute;
    top: 0;
    display: none;
}
.wrap .bottom ul li.active{
    display: block;
    background-color: green;
    
}